Re: Question on BIGGEST_ALIGNMENT in GCC on NetBSD/m68k

Le 16/06/2025 à 09:39, John Paul Adrian Glaubitz a écrit :
>> You will create the exact same problem you want to fix: we can guess
>> some softwares are built on linux/m68k with 2byte alignment in mind. So
>> once the ABI is changed, you'll have to track them to fix them.
> Could you point me to these packages which assume 2 bytes alignment? I'm genuinely
> interested as I would like to put these up on the wiki. So far I haven't found any.
> 
> I have used Debian's rebootstrap to create an initial set of m68k packages with
> 4 bytes alignment and didn't run into any problems yet.
> 
> The Gentoo developers have also successfully created a chroot with 4 bytes alignment:
> 
> https://dev.gentoo.org/~dilfridge/m68k/
> 
> I have tried it and it worked fine for me with qemu-user.
> 
> So, if there is any software that is incompatible with 4 bytes alignment on m68k, I
> would like to hear about it.

qemu-user is one of these softwares that know m68k has alignment of 
2byte. All the structures translated from the m68k chroot to the host 
kernel are with a 2byte alignment.

Thanks,
Laurent